A117268 Triangle, binomial transform of the tribonacci sequence.

1, 1, 1, 2, 1, 2, 4, 2, 3, 5, 7, 4, 6, 9, 14, 13, 7, 11, 17, 26, 40, 24, 13, 20, 31, 48, 74, 114, 44, 24, 37, 57, 88, 136, 210, 324, 81, 44, 68, 105, 162, 250, 386, 596, 920

Offset

1,4

Comments

Leftmost column of the triangle = the tribonacci sequence A000073.

Rightmost diagonal of the triangle = A117189.

Links

Table of n, a(n) for n=1..45.

Formula

Difference rows of A117267 become rows of A117268

Example

Taking difference rows of A117267: (1; 1, 2; 2, 3, 5; 4, 6, 9, 14;...), we get A117268:
1;
1, 1;
2, 1, 2;
4, 2, 3, 5;
7, 4, 6, 9, 14;
13, 7, 11, 17, 26, 40;
24, 13, 20, 31, 48, 74, 114;
...

Crossrefs

Cf. A117267, A117189 (row sums), A000073.

Sequence in context: A184990 A206299 A276053 * A361076 A279709 A261880

Adjacent sequences: A117265 A117266 A117267 * A117269 A117270 A117271

Keyword

nonn,tabl

Author

Gary W. Adamson, Mar 05 2006

Status

approved